Rotary converter system.



UNIT STATES PATENT OFFICE.

winner s. Roo ot NEW YORK, N. 'Y., ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION or PENN- SYLVANIA.

Specification of Letters Patent.

ROTARY CONVERTER SYSTEM.

Patented April 30, 1907.

Be known that l, WALTER SI RUGG, a citizen of the United States, and a resident of New York, in the county of New York and State of New Yorl;', have invented a new and useful Improvement in Rotary Converter Systems, of which the following is a specification.

Mv--i1np'rovement relates to systems of [0 electrical distribution embodying rotary convener ted it'hasfor its object to provide means for controllin the speed of such machines.

Under certain conditions of operation of rotary converters connected with large systems of distribution, the machines tend to attain dangerous speeds and some means is therefore desirable for preventing an increase of speed beyond a certain limit. The means generally employed consists of circuit-breakers which are operated to open the direct current circuit or circuits. While the interruption of the direct current circuit will serve to prevent a rotary converter from attaining a dangerous speed, provided a suitable governing means is em )loyed, I prefer to utilize a means which will automatically regulate the speed of the converter without putting it out of service. I have therefore devised the means shown in the accompanying drawings, in which Figure 1 is a diagram of a system embodying one form of my invention and Fig. 2 is a similar View of a modification.

Referring first to Fig. 1, the rotary converter 1, comprising an armature 2, field magnet windings 3, collector rings and brushes 41 and a commutator 5, is supplied with alternating current energy from a twophase circuit (5, through the collector rings and brushes 4, and supplies direct current energy to translating devices 7, through conductors 8, by means of the commutator 5. As here shown, an. adjustable rheostat 18 is connected in. series with the field magnet winding 3 and its movable member 19. is connected, by suitable gearing, to the arma ture 20 of a small shunt-wound motor 21, the circuit of which. is opened and closed by means of a double throw switch 2" in the circuitof a battery 12. The movable member 23 of the switch 22 is mounted upon a movable bar 13 formed of magnetizable material or provided with magnetizable" parts within the magnetic field of two magnets 16 and 17, the winding of the former being connected across two conductors'of the circuit 6 and the winding of the latter being connected across the circuit 8.

When the movable member 23 of. the switch 22 is in the position indicated in the drawing, the circuit of the motor 21 is open. If the member 13is attracted by the magnet .17, switch member 23 will be actuated to so connect the motor 21 with the battery terminals that it will actuate the arm 19 in the proper direction to cut resistance out of the field magnet circuit of the rotary converter; and if the magnet 16 attracts the other end of the member 13, the switch 22 will be moved toso connect the motor 21 to the bat tery as to effect rotation of its armature 20 in the opposite direction and thus correspondingly move the arm 19 to cut resistance into the field magnet circuit of the rotary converter 1.

In Fig. 2, I have shown the rotary converter 1 as supplied with alternating current energy from a three-phase circuit 6 and have connected across this circuit a three-phaseinduction motor 24 wh ch is mechanically connected to the armature 20 of a shuntwound motor 21 that is connected also to the movable member 19 of a rheost'at 18. If the torque of each of these motors opposes that of the other, the two will be balanced, except in case of a change in the rate of alternations in the circuit 6*, and when this change occurs, the motors will rotate in the one direction or the other, depending upon whether the alternations increase or decrease in rate, and consequently the amount of resistance 18 included in the field magnet circuit of the rotary converter will be increased or decreased to 'efiect corresponding control of the rotaryconvert-er speed;

\Yhichever modification is utilized, an alternating current winding and a direct current winding are opposed to each other and consequently a more positive adjustment is effected than is possible when the two, windings are both connected to the alternat mg current circuit.

The control ing devices shown in Fig. 1 may, if desired, be mounted upon the main switchboard, and the employment'of a sop arate circuit between the rotary converter and the switchboard be thereby avoided.

The form and relative location of parts nay be varied materially from What is shown, "Wl'ljh'dlll departing from my invention, and I th refore desire it to be understood that no are to be imposed, except such as i necessary by what is embodied ii with a rotary contat i'or varying its field ation, oi two opposing eleetro-rnaged to movable the rheostat one of which is en- -1'n the al mating; currciiit circuit i of which energized from the i it to which the rotary JILllDLL/Qd.

combination with a rotary cona speed regulating device therer opposing controlling devices for peed. regulating device that are re- "iergized hour the alternating fan-d from the direct current one it to hich. the rotary converter is conrte r regulating means there i, We opposing magneto-electric adjusting devices for said speed regulating 0 means, one of Which is energized from the .alternating current circuit, and the other oi. which is energized from. the direct, current circuit to which the rotary converter is con-V I Il-Efltfifi.

'ih-e combination with a rotary con vertcr and speed 'i'eguiating means thereinvention:

In with a rotar coir for, of two opposing electro-magnet1c demeans and electrical connections between said opposing devices and. the respective circuits to which the rotary converter is con nected.

5. The combination with a rotary converter and means for adjusting the field magnet excitation thereof, of a inotorfor actuating said adjusting means and an electro-magnetic device having opposing windings that are respectively connected to the alternating current circuit and to the direct current circuit to which the rotary converter is con nected,- for controlling the direction of rotation of said motor in accordance with the rate of alternations insaid alternating cur rent circuit.

6. The combination with a rotary con- In testimony whereof, I have hereunto subscribed my name this 20th day of January, 1905.

' WALTER S. RUGG.

Witnesses WM. H. CAPEL, GEORGE I-I. S'rooKBRuJGE. 

